rutabaga_gfx: establish crate OWNERS.

GFX work often requires review from domain experts,
but until now we have not formally enumerated this
list.

BUG=b:328338772
TEST=n/a

Change-Id: I80f81ac542333606bb9e14e1dd653098204de3bb
Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/5529960
Reviewed-by: Jason Macnak <natsu@google.com>
Commit-Queue: Noah Gold <nkgold@google.com>
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>
Reviewed-by: Colin Downs-Razouk <colindr@google.com>
Reviewed-by: Ryan Neph <ryanneph@google.com>
Reviewed-by: Kaiyi Li <kaiyili@google.com>
Reviewed-by: Dawn Han <dawnhan@google.com>
Reviewed-by: Dennis Kempin <denniskempin@google.com>